Calm window manager (mainly known for its shorthand name cwm) is a member of a once-powerful and now-declining family of minimalist X11 window managers. It is relatively unknown outside the OpenBSD community, but it deserves more notice.

For the record, if you read the links I supplied what you, and others refer to with "feels like a break" unlike using keyboard shortcuts is a result of an Attentional Blink (https://en.wikipedia.org/wiki/Attentional_blink) where the cognitive retrieving of a keyboard shortcut causes you to feel like it's faster, while the mouse, with no need for a cognitive retrieval of a shortcut feels slower.